Riffle-box.



K. F. NELSON.

RIFFLE BOX.

APPLIGATION FILED FEB. 21, 1913.

INVENTOR 137 4 4 fill E 50w Attorney Patented July 28, 1914.

WI TNESSES KARL r. NELSON, orxnnnoe mnno;

' nIrrLE-Box;

Specification of Letters Patent.

Patented July 28, 19 14.

Application filed February 21 1913. Serial No. 749,904.

To all whom it may concern:

Be it known that I, KARL F. NELSON, a citizen of the United States, residing at Kellogg, in the county of Shoshone and State of Idaho, have invented certain new and useful Improvements in Riffle-Boxes, of which the following is a specification.

This invention relates to that class of ore separators known as self-discharging riflle boxes, the same comprising a stationary box ,or trough containing riflles which gather the values and deflect the same into a launder arranged alongside the'box.

It is the objectof the present invention to provide a novel arrangement of riflles to be hereinafter described in detaihwhereby the apparatus is made to operate with a greater efliciency, and also to provide a launder for each side of the riflie-box, the ritlies being arranged to deflect the values into both launders.

The invention also has for its object to provide a structure which is simple and durable, the number of parts being reduced to a minimum.

I11 order that the invention may be better understood, reference is had to the accompanying drawing in which- Figure 1 is a plan view of a riflle box and launders constructed and arranged in accordance with the invention. Fig. 2 is a side elevation partly in section on the line 2-2 of Fig. 1. Fig. 3 is an enlarged transverse section on the line 3-3 of Fig. 1.

Referring specifically to the drawing, the riffle box is of any suitable length and has a bottom 5 which is crowned transversely and is formed of sheet steel, the side edges of which are bent down to form flanges 6 for attachment of the sides 7 of the box, said sides being also of sheet steel. In order to simplify and cheapen the structure, and reduce the number of parts to a minimum, the sides 7 are continued downward from the bottom 5 of the box as indicated at 8, and are then bent outward horizontally as indicated at 9, and then upward as indicated at 10 to form the launders. The parts 8 and 10 form the side walls of the launders and the parts 9 form the bottom thereof. Thus it will be seen that the box and launders require only three pieces of sheet steel,

the sheets forming the launders being bolted or otherwise secured to the flanges 6 as indicated at 11. p

In the box, onthe bottom 5 thereof, are

mounted angular riffles 12 which may be small strips of steel bent intermediate their ends and fastened tothe bottom in any suitable manner so that they may be removed at any time when necessary. ,As shown in d Fig. 1, the apices of the riffles are at the longitudinal center of the box, from which the two ends of the riffles extend divergingly to the sides? of the box, the inclination be:

ing-in the direction of the lower or discharge end of the box. I The riffles are also set closer together at the lower end of the box than at the upper or receiving end thereof, and a few of the lowermost rifltles are divided at the center of the box to provide a narrow space therebetween.

In the side walls 7 of the'box, close to the bottom 5 thereof, and at the outer end of each riflle 12, is a discharge opening 13.

The box, as well as the launders are deeper at their discharge ends than at their receiv ing ends, and the box is set so that it inclines toward its discharge end.

In operation, ore and water are discharged into thebox at its upper or highest end. As the ore passes over the rifiles, the values are gathered by the latter and with the assistance of the water carried through the openings 13 into the launders, .and as the ore passes down to the lower end of the box where the rifiies are set closer together,'the latter continue to gather the finer particles, all of which are gathered, the rocks being forced over the rifiles and out of the lower end of the box. The angularity of the riflles and the crowning of the bottom 5 of the box, cause the values to spread and pass from opposite sides of the box into the launders.

By spacing the lowermost riflles at their inner ends, the liability of the waste being carried sidewise with the values to the launders is reduced to a minimum. The waste is allowed to pass down the riflie box along the center line thereof in the space between the inner ends of the rifl'les, whereas the values are carried sidewise by the riflles to the launders. The waste does not follow the values but is discharged at the lower the box, the inclination being in the direc- 10 end of the rifi'tle box.

ton of the discharge end of the box. I claim: 1 f In testimony whereof I aifix mysignal- 3 riflie boxfhaviing sidefi outlet opginings .ture in presence of two Witnesses.

5 an a series 0 obi ue ri es the ri es at 1 1 r T the discharge end 0% thebox being spaced KARL NELSO1\' apart at the longitudinal center line ofthe Witnesses: box, from which latter they extend diverg- GUsTAr H. SAMUELSON, ingly in opposite directions to the sides of FREDERIG F. DONALDSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent:, walhington l). O. 

